The Sydney Harbour Bridge - J. J. C. Bradfield - PowerPoint PPT Presentation

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The Sydney Harbour Bridge - J. J. C. Bradfield

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The Old Coat hanger The Sydney Harbour Bridge - J. J. C. Bradfield & Ralph Freeman - 1,650 Steel Arch Main Span Worlds broadest roadway: 8 lanes ... – PowerPoint PPT presentation

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Title: The Sydney Harbour Bridge - J. J. C. Bradfield


1
The Old Coat hanger
The Sydney Harbour Bridge - J.
J. C. Bradfield Ralph Freeman -
2
Harbour Bridge
  • 1,650 Steel Arch Main Span
  • Worlds broadest roadway 8 lanes, 4 rail lines,
    2 walkways
  • Worlds 2nd longest arch bridge when completed
  • Bayonne Bridge main arch span 1,675
  • Connects northern Sydney to the southern urban
    center
  • Considered Sydneys most famous landmark 2nd to
    Opera House
  • Average traffic per day 160,000 Vehicles

3
Sydney Harbour
4
Other Proposals for the Crossing
5
Design bids by Ralph Freeman with Dorman Long
Co.
Design Main Span Cost
Cantilever 1,600 22,200,000
Cantilevered Arch 1,650 18,200,000
Arch 1,650 17,100,000
Pounds Sterling converted to American dollars by 1 4.8665 Table and illustration from April 1932 Civil Engineering Pounds Sterling converted to American dollars by 1 4.8665 Table and illustration from April 1932 Civil Engineering Pounds Sterling converted to American dollars by 1 4.8665 Table and illustration from April 1932 Civil Engineering
6
Sydney Harbour
Hellgate
7
Upper Chords
  • Upper Arch Chord provides virtually no load
    bearing capacity, only stiffness
  • Originally designed for upper chord to end
    within towers as at Hellgate
  • Architectural consultants decided that visually
    separating the upper chord from the towers
    conveys sense of structural independence from the
    masonry towers

8
Upper Chord Differences
9
Construction
  • Each Arch half anchored to abutment...

then cantilevered out with use of creeper
cranes that traveled along the upper arch chord
10
Deck Construction
11
Bridge Opening
  • Bridge opened on Saturday March 19, 1932 by J.
    T. Lang, Prime Minister of New South Wales
  • Estimated 300,000 to 1 million people in
    attendance
  • Public allowed to walk across roadway deck, an
    event only repeated on the 50th anniversary of
    opening
  • Capt. Francis De Groot of the paramilitary group
    the New Guard on horseback charged and slashed
    the ribbon before the bridge could be declared
    open

12
Bridge Climb!
  • Thousands of people take guided bridge climbs
    every year.
  • In order to make the Bridge Climb you must
  • pay around 150
  • Remove all loose articles (including cameras)
  • Be in good physical health and not be pregnant
  • pass a breathalyzer test.

13
Summary The 3 Ss
  • Social The public interacts with structure
    through pylon museum bridge climb. Bridge
    tolls payback construction and maintenance costs
    (current bridge toll 2). Arch form cheapest
    solution.
  • Scientific Largest 3rd longest steel trussed
    arch (1650 span). Load tested with 96 steam
    locomotives in various configurations. Load
    transferred to abutments entirely through lower
    arch chord.
  • Symbolic Imitative of Hellgate, but on much
    larger scale. Massive structural form visually
    separated from purely decorative masonry towers.
    An Elegant representation of Sydneys unity and
    perseverance through financial depression.

14
(No Transcript)
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